Nine (9%) per cent of the respondents to the Politico/Morning Consult poll said the debate changed their minds about whom to vote for. Nine per cent of the electorate is a lot. If we assume that two-thirds of these voters switched to Clinton and one-third switched to Trump, which would be in line with the finding that Clinton won the debate by a two-to-one margin among respondents, we could expect the polls to swing in her favor by three (3%) per cent.